Hyper-V Live Migration doesn't work

Hi Team,
I'm using Mitaka cluster driver with OVS 2.5.
When I perform live migration, an instance loses network connection but succesfully goes to another hosts.
There was a bug in Liberty where ovs port had not been migrated to target hosts but now it is seems to be okay, ovs port is on target host but add with errors.

If I execute the command (ovs-vsctl --timeout=120 -- --if-exists del-port 4b26fd63-e779-49c9-b419-ac2c53ef8c9a ....) logged in nova manually then I get network connection even without restarting the services.